My favorite part: “Nowadays, the performance of both for-of and forEach is on par with the old-fashioned for loop.” 
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Felt so good to be able to finally say that! More details about our recent work on improving array built-ins coming soon

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Very nice! It seems the link to https://cs.chromium.org/chromium/src/v8/src/elements-kind.h?l=14&rcl=a7e622ba330d046295b61bf6fa9f296a99aafa77 … is outdated. Some names don’t match the ones in the article.
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Good catch — I’ve updated the link now. (While writing this, I renamed elements kinds throughout V8 to make them easier to reason about.)
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Is it possible to recognize patterns like `new Array(N).fill(null)` to preallocate packed elements, or it isn't worth it?
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You mean that Array#fill would turn the array into PACKED mode?
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Great presentation at
@munichjs ! Especially the part about onion trees!
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